JP2005083395A - Pressure opening and shutting valve - Google Patents

Pressure opening and shutting valve Download PDF

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Publication number
JP2005083395A
JP2005083395A JP2003312477A JP2003312477A JP2005083395A JP 2005083395 A JP2005083395 A JP 2005083395A JP 2003312477 A JP2003312477 A JP 2003312477A JP 2003312477 A JP2003312477 A JP 2003312477A JP 2005083395 A JP2005083395 A JP 2005083395A
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Prior art keywords
valve
valve body
pressure
housing
positive pressure
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JP2003312477A
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Japanese (ja)
Inventor
Koji Sato
廣司 佐藤
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Nifco Inc
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Nifco Inc
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Application filed by Nifco Inc filed Critical Nifco Inc
Priority to JP2003312477A priority Critical patent/JP2005083395A/en
Priority to US10/923,883 priority patent/US20050051216A1/en
Priority to GB0419212A priority patent/GB2405684B/en
Priority to CNB2004100742493A priority patent/CN100383448C/en
Priority to KR1020040070390A priority patent/KR100676047B1/en
Publication of JP2005083395A publication Critical patent/JP2005083395A/en
Pending legal-status Critical Current

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M25/00—Engine-pertinent apparatus for adding non-fuel substances or small quantities of secondary fuel to combustion-air, main fuel or fuel-air mixture
    • F02M25/08—Engine-pertinent apparatus for adding non-fuel substances or small quantities of secondary fuel to combustion-air, main fuel or fuel-air mixture adding fuel vapours drawn from engine fuel reservoir
    • F02M25/0836—Arrangement of valves controlling the admission of fuel vapour to an engine, e.g. valve being disposed between fuel tank or absorption canister and intake manifold
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60K—ARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES; ARRANGEMENT OR MOUNTING OF PLURAL DIVERSE PRIME-MOVERS IN VEHICLES; AUXILIARY DRIVES FOR VEHICLES; INSTRUMENTATION OR DASHBOARDS FOR VEHICLES; ARRANGEMENTS IN CONNECTION WITH COOLING, AIR INTAKE, GAS EXHAUST OR FUEL SUPPLY OF PROPULSION UNITS IN VEHICLES
    • B60K15/00—Arrangement in connection with fuel supply of combustion engines or other fuel consuming energy converters, e.g. fuel cells; Mounting or construction of fuel tanks
    • B60K15/03—Fuel tanks
    • B60K15/035—Fuel tanks characterised by venting means
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
    • F16K1/00—Lift valves or globe valves, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces
    • F16K1/32—Details
    • F16K1/34—Cutting-off parts, e.g. valve members, seats
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
    • F16K17/00—Safety valves; Equalising valves, e.g. pressure relief valves
    • F16K17/18—Safety valves; Equalising valves, e.g. pressure relief valves opening on surplus pressure on either side
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
    • F16K17/00—Safety valves; Equalising valves, e.g. pressure relief valves
    • F16K17/18—Safety valves; Equalising valves, e.g. pressure relief valves opening on surplus pressure on either side
    • F16K17/19—Equalising valves predominantly for tanks
    • F16K17/196—Equalising valves predominantly for tanks spring-loaded
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
    • F16K27/00—Construction of housing; Use of materials therefor
    • F16K27/02—Construction of housing; Use of materials therefor of lift valves
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T137/00—Fluid handling
    • Y10T137/7722—Line condition change responsive valves
    • Y10T137/7771—Bi-directional flow valves
    • Y10T137/7772—One head and seat carried by head of another
    • Y10T137/7777—Both valves spring biased

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Combustion & Propulsion (AREA)
  • Chemical & Material Sciences (AREA)
  • Transportation (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Sustainable Energy (AREA)
  • Sustainable Development (AREA)
  • Safety Valves (AREA)
  • Cooling, Air Intake And Gas Exhaust, And Fuel Tank Arrangements In Propulsion Units (AREA)
  • Supplying Secondary Fuel Or The Like To Fuel, Air Or Fuel-Air Mixtures (AREA)
  • Details Of Valves (AREA)

Abstract

<P>PROBLEM TO BE SOLVED: To provide a pressure opening and shutting valve capable of controlling occurrence of beating noises without blocking smoothness of operation. <P>SOLUTION: The opening and shutting valve (1) comprises a housing (a housing body 3 and a housing cap 5) having first port (a fluid passage 6) and a second port (hose connecting nozzle 4), and a valve body (positive pressure valve body 7), which is housed in the housing, normally blocking the first port by urging with a spring (a coil spring 8 with a large diameter) and opening when differential pressure between the first port and the second port exceeds a designated value. An axis of urging force for closing a valve by means of the valve body is set to be non-parallel to an axis of a valve seat (a positive pressure valve seat 13) that brings into contact with the valve body. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

本発明は、管路の途中に設けられ、弁体の前後の差圧に応じて自動的に開閉するように構成された圧力開閉弁に関し、例えば自動車等の燃料タンク内の圧力を所定範囲に維持するために燃料タンクとキャニスタとの間に設けられる２方向弁に好適な圧力開閉弁に関するものである。   The present invention relates to a pressure on-off valve that is provided in the middle of a pipeline and is configured to automatically open and close in accordance with a differential pressure before and after a valve body. For example, the pressure in a fuel tank of an automobile or the like is within a predetermined range. The present invention relates to a pressure on-off valve suitable for a two-way valve provided between a fuel tank and a canister in order to maintain.

自動車の燃料タンクとキャニスタとの間には、燃料タンク内の圧力を所定範囲に維持するために、２方向について個別に逆止作用を備えた圧力開閉弁が設けられている。この圧力開閉弁は、給油時はタンク内圧の上昇で満タン検知ができるように両方向共に閉弁し、温度上昇などでタンク内圧が所定値を超えた際には、油面上の蒸発ガスをキャニスタに吸着させる方向に開弁し、タンク内が大気圧より減圧した際には、キャニスタ側から大気圧を導入する方向に開弁するようになっている。   In order to maintain the pressure in the fuel tank within a predetermined range, a pressure on / off valve having a check function is provided separately in two directions between the fuel tank and the canister of the automobile. This pressure on / off valve is closed in both directions so that full tank detection can be performed when the tank internal pressure rises during refueling.When the tank internal pressure exceeds a predetermined value due to temperature rise, etc., evaporative gas on the oil level is removed. The valve is opened in a direction to be adsorbed by the canister, and when the inside of the tank is depressurized from the atmospheric pressure, the valve is opened in a direction to introduce the atmospheric pressure from the canister side.

従来、この種の圧力開閉弁として、タンク側が正圧時に開弁する正圧弁体内に、タンク側が負圧時に開弁する負圧弁体を組み込んだ構造が知られている（特開平９−６０７４４号公報などを参照されたい）。
特開平９−６０７４４号公報 Conventionally, as this kind of pressure on-off valve, a structure is known in which a negative pressure valve body that opens when the tank side opens when the tank side is positive pressure is incorporated (Japanese Patent Laid-Open No. 9-60744). Please refer to the gazette.)
Japanese Patent Laid-Open No. 9-60744

上記従来の圧力開閉弁においては、正圧弁体を受容したハウジングの内周面と正圧弁体の外周面との間をタンク内正圧時に流体が流れる際に乱流が発生し、これによって振動した正圧弁体がハウジングの内周面にぶつかって打音を発生するという問題があった。また車体振動の影響によってハウジング内で正圧弁体が踊り、これによっても打音が発生するという問題があった。   In the conventional pressure on-off valve described above, turbulent flow is generated when a fluid flows between the inner peripheral surface of the housing that receives the positive pressure valve body and the outer peripheral surface of the positive pressure valve body at the time of positive pressure in the tank. There is a problem that the positive pressure valve body hits the inner peripheral surface of the housing and generates a hitting sound. In addition, there is a problem that the positive pressure valve body dances in the housing due to the influence of the vehicle body vibration, which also generates a hitting sound.

このような打音の発生を防止するには、ハウジング内で正圧弁体が踊らないように両者の嵌め合い隙間を小さくすることが考えられるが、円滑な正圧弁体の作動を確保する上には、打音発生を防止し得る程度に隙間を小さくすることは困難である。即ち、従来の圧力開閉弁は、円滑な作動を確保した上で打音の発生を防止することが困難であった。   In order to prevent the occurrence of such a hitting sound, it is conceivable to reduce the fitting gap between the two so that the positive pressure valve body does not dance in the housing, but in order to ensure smooth operation of the positive pressure valve body. However, it is difficult to reduce the gap to such an extent that it is possible to prevent the occurrence of hitting sound. That is, it has been difficult for conventional pressure on-off valves to prevent the occurrence of hitting sound while ensuring a smooth operation.

このような課題を解決し、作動の円滑性を阻害せずに打音の発生を抑制することのできる圧力開閉弁を提供するために本発明の請求項１は、第１ポート（流体通路６）と第２ポート（ホース接続口４）とを備えたハウジング（ハウジング主部３及びハウジングキャップ５）と、該ハウジング内に収容され、ばね（大径コイルばね８）によって付勢されて前記第１ポートを通常は閉塞し且つ前記第１ポートと前記第２ポートとの差圧が所定値を超えると開く弁体（正圧弁体７）とを有する圧力開閉弁（１）において、前記弁体に作用する前記ばねによる閉弁付勢力の軸線が、前記弁体が当接する弁座（正圧弁座１３）の軸線に対して不平行となるようにしたことを特徴とするものとした。   In order to solve such a problem and to provide a pressure on-off valve capable of suppressing the occurrence of a hitting sound without impairing the smoothness of operation, claim 1 of the present invention provides a first port (fluid passage 6). ) And a second port (hose connection port 4) and a housing (housing main portion 3 and housing cap 5), housed in the housing, and urged by a spring (large-diameter coil spring 8). In the pressure on-off valve (1) having a valve body (positive pressure valve body 7) that normally closes one port and opens when a differential pressure between the first port and the second port exceeds a predetermined value, the valve body The axis of the valve closing urging force by the spring acting on the valve body is made non-parallel to the axis of the valve seat (positive pressure valve seat 13) with which the valve body abuts.

また本発明の請求項２は、第１ポート（流体通路６）と第２ポート（ホース接続口４）とを備えたハウジング（ハウジング主部３及びハウジングキャップ５）と、該ハウジング内に収容され、燃料タンク内の正圧に抗してばね（大径コイルばね８）によって閉弁付勢されて所定の正圧値で開弁する正圧弁体（７）と、燃料タンク内の負圧に抗してばね（小径コイルばね１１）によって閉弁付勢されて所定の負圧値で開弁する負圧弁体（１０）とを有し、燃料タンク内の液面上空間とキャニスタとを結ぶ通路内に設けられた圧力開閉弁（１）において、前記正圧弁体に作用する前記ばねによる閉弁付勢力の軸線が、前記正圧弁体が当接する弁座（正圧弁座１３）の軸線に対して不平行となるようにしたことを特徴とするものとした。   According to a second aspect of the present invention, a housing (housing main portion 3 and housing cap 5) having a first port (fluid passage 6) and a second port (hose connection port 4) is accommodated in the housing. A positive pressure valve body (7) that is energized by a spring (large-diameter coil spring 8) against a positive pressure in the fuel tank and opens at a predetermined positive pressure value, and a negative pressure in the fuel tank. And a negative pressure valve body (10) which is energized by a spring (small coil spring 11) to open at a predetermined negative pressure value, and connects the space above the liquid level in the fuel tank and the canister. In the pressure on-off valve (1) provided in the passage, the axis of the valve closing biasing force by the spring acting on the positive pressure valve body is the axis of the valve seat (positive pressure valve seat 13) with which the positive pressure valve body abuts. It was characterized by being non-parallel with respect to it.

そして本発明の請求項３は、上記の圧力開閉弁において、前記ばねをコイルばね（大径コイルばね８）とし、前記弁座の中心軸に対して直角以外の角度をもって交わるばね座（ばね支承部２５）を前記ハウジング（ハウジングキャップ５）に設け、自然状態時の軸線が前記弁座（正圧弁座１３）の軸線に対して不平行となるように前記コイルばねを前記ばね座に装着したことを特徴とするものとした。   According to a third aspect of the present invention, in the pressure on-off valve, the spring is a coil spring (large-diameter coil spring 8), and the spring seat (spring support) intersects at an angle other than a right angle with respect to the central axis of the valve seat. Portion 25) is provided in the housing (housing cap 5), and the coil spring is mounted on the spring seat so that the axis in the natural state is not parallel to the axis of the valve seat (positive pressure valve seat 13). It was characterized by that.

さらに本発明の請求項４は、前記ばねが、両端の中心同士を互いにオフセットさせて巻いたコイルばね（２６）からなることを特徴とするものとした。   According to a fourth aspect of the present invention, the spring comprises a coil spring (26) wound with the centers of both ends being offset from each other.

このような本発明の圧力開閉弁によれば、弁体に作用する閉弁力の作用軸線がハウジングの中心軸に対して角度が付くので、ハウジングの内面に意図的に弁体を片当たりさせることができる。これにより、ハウジングと弁体との間の隙間を十分に空けておいても、ハウジング内で弁体が踊ることがなくなり、打音を発生しなくなる。即ち、本発明により、作動の円滑性を確保した上での打音発生の抑制に多大な効果を奏することができる。   According to such a pressure on-off valve of the present invention, the operating axis of the valve closing force acting on the valve body is angled with respect to the central axis of the housing, so that the valve body is intentionally allowed to strike the inner surface of the housing. be able to. Thereby, even if the clearance gap between a housing and a valve body is fully opened, a valve body does not dance in a housing and it does not generate | occur | produce a hit sound. That is, according to the present invention, a great effect can be achieved in suppressing the occurrence of a hitting sound while ensuring smooth operation.

以下、添付の図面に示された実施例に基づいて本発明を具体的にかつ詳細に説明する。   Hereinafter, the present invention will be described specifically and in detail based on embodiments shown in the accompanying drawings.

図１、２は、本発明が適用された２方向弁としての圧力開閉弁である。この圧力開閉弁１は、ホース接続体２が一体形成されたハウジング主部３と、第２ポートをなすホース接続口４が一体形成されたハウジングキャップ５と、ホース接続体２内に形成された第１ポートをなす流体通路６とハウジング主部３との間の連通を断続する正圧弁体７と、正圧弁体７を閉弁付勢する大径コイルばね８と、正圧弁体７の中心部に形成された負圧通路９を開閉する負圧弁体１０と、負圧弁体１０を閉弁付勢する小径コイルばね１１とで構成されている。   1 and 2 are pressure on / off valves as two-way valves to which the present invention is applied. This pressure on-off valve 1 is formed in a housing main part 3 integrally formed with a hose connector 2, a housing cap 5 integrally formed with a hose connection port 4 forming a second port, and a hose connector 2. A positive pressure valve body 7 for intermittently communicating between the fluid passage 6 forming the first port and the housing main portion 3, a large-diameter coil spring 8 for closing and energizing the positive pressure valve body 7, and the center of the positive pressure valve body 7 It comprises a negative pressure valve body 10 that opens and closes a negative pressure passage 9 formed in the section, and a small-diameter coil spring 11 that urges the negative pressure valve body 10 to close.

ハウジング主部３は、ホース接続体２の反対側が拡開された概ね碗形の輪郭を有し、そのホース接続体２の付け根の内側、つまり流体通路６のハウジング主部３内への開口部には、流体通路６の内径よりやや拡径された負圧弁体収容部１２が形成されている。この負圧弁体収容部１２のハウジング主部３内へ向けての開口の周囲には、ハウジング主部３側へ向けて拡開する円錐面からなる正圧弁座１３が形成されている。また負圧弁体収容部１２の内周面には、小径コイルばね１１を支承するために軸方向に沿う複数の突条１４が円周を等分割する位置に突設されている。   The housing main part 3 has a generally bowl-shaped profile that is widened on the opposite side of the hose connector 2, and is an opening inside the base of the hose connector 2, that is, the fluid passage 6 into the housing main part 3. Is formed with a negative pressure valve body accommodating portion 12 that is slightly larger in diameter than the inner diameter of the fluid passage 6. A positive pressure valve seat 13 having a conical surface expanding toward the housing main portion 3 is formed around the opening of the negative pressure valve body housing portion 12 toward the housing main portion 3. On the inner peripheral surface of the negative pressure valve body housing portion 12, a plurality of protrusions 14 extending in the axial direction are provided at positions that equally divide the circumference in order to support the small-diameter coil spring 11.

ハウジングキャップ５は、その中心部にホース接続口４が結合された実質的に円板状をなし、ハウジング主部３の開口端に、例えば超音波溶着によって接着固定されている。   The housing cap 5 has a substantially disk shape with a hose connection port 4 coupled to the center thereof, and is bonded and fixed to the open end of the housing main portion 3 by, for example, ultrasonic welding.

正圧弁体７は、略有底円筒状をなし、その底壁中央部に貫通孔１５が設けられると共に、この貫通孔１５に連なる負圧通路９を画定する管状部１６が、正圧弁体７の内方へ向けて軸方向に沿って形成されている。この管状部１６の内周面には、軸方向に沿う４本の突条１７が円周を等分割する位置に突設されている。また正圧弁体７には、軸方向に沿う４本の突条１８が、その外周面における円周を等分割する位置に突設され、その底壁外面における貫通孔１５の外周には、外周面が球帯状をなす環状膨出部１９が形成され、貫通孔１５の内周、即ち負圧通路９の開口部には、負圧弁体収容部１２側へ向けて拡開する円錐面からなる負圧弁座２０が形成されている。   The positive pressure valve body 7 has a substantially bottomed cylindrical shape, and a through hole 15 is provided at the center of the bottom wall, and a tubular portion 16 that defines a negative pressure passage 9 connected to the through hole 15 is a positive pressure valve body 7. It is formed along the axial direction toward the inside. On the inner peripheral surface of the tubular portion 16, four projecting ridges 17 along the axial direction are provided so as to project the circumference equally. Also, the positive pressure valve body 7 is provided with four protrusions 18 extending along the axial direction at positions that equally divide the circumference of the outer peripheral surface thereof, and the outer periphery of the through hole 15 on the outer surface of the bottom wall has an outer periphery. An annular bulging portion 19 having a spherical surface is formed, and the inner periphery of the through hole 15, that is, the opening of the negative pressure passage 9, is formed of a conical surface that expands toward the negative pressure valve body housing portion 12 side. A negative pressure valve seat 20 is formed.

この正圧弁体７は、ハウジング主部３に形成された正圧弁座１３側に環状膨出部１９を向けてハウジング主部３内に配置されており、その底壁内面とハウジングキャップ５の軸方向内面との間に縮設された大径コイルばね８により、環状膨出部１９を正圧弁座１３に当接させる向きに常時弾発付勢されている。このようにして、正圧弁座１３に対して環状膨出部１９を接離させることで開閉弁の作用を発揮するようになっている。   The positive pressure valve body 7 is disposed in the housing main portion 3 with the annular bulging portion 19 facing the positive pressure valve seat 13 formed on the housing main portion 3, and the inner surface of the bottom wall and the shaft of the housing cap 5. The large-diameter coil spring 8 contracted between the directional inner surface is always elastically biased in a direction in which the annular bulging portion 19 is brought into contact with the positive pressure valve seat 13. In this way, the operation of the on-off valve is exhibited by bringing the annular bulging portion 19 into and out of contact with the positive pressure valve seat 13.

負圧弁体１０は、弁頭部２１と軸部２２とを一体形成したものであり、管状部１６の内面の４本の突条１７間に軸部２２を挿通することにより、軸方向移動可能に正圧弁体７に係合している。そして弁頭部２１の軸部２２側の外面には、球帯状部分２３が形成されている。この負圧弁体１０は、負圧弁体収容部１２内のその基端が支承された小径コイルばね１１により、球帯状部分２３を負圧弁座２０に当接させる向きに常時弾発付勢されており、負圧弁座２０に対して球帯状部分２３を接離させることで開閉弁の作用を発揮するようになっている。   The negative pressure valve body 10 is formed by integrally forming a valve head 21 and a shaft portion 22, and is movable in the axial direction by inserting the shaft portion 22 between four protrusions 17 on the inner surface of the tubular portion 16. The positive pressure valve body 7 is engaged. A spherical band portion 23 is formed on the outer surface of the valve head 21 on the shaft portion 22 side. The negative pressure valve body 10 is constantly elastically biased in a direction in which the ball-shaped portion 23 is brought into contact with the negative pressure valve seat 20 by a small-diameter coil spring 11 whose base end in the negative pressure valve body housing portion 12 is supported. In addition, the action of the on-off valve is exhibited by bringing the ball-shaped portion 23 into and out of contact with the negative pressure valve seat 20.

ホース接続体２には、自動車の燃料タンクの液面上空間に内設されたフロート弁（図示せず）の出口にゴムホースを介して接続される２つのホース口２４が形成されている。なお、ホース口２４の向き及び数量は、燃料タンクの形式に応じて適宜に定められるものであり、本実施例の形態に限定されるものではない。   The hose connector 2 is formed with two hose ports 24 connected to the outlet of a float valve (not shown) provided in the liquid level space of the fuel tank of the automobile via a rubber hose. In addition, the direction and quantity of the hose port 24 are appropriately determined according to the type of the fuel tank, and are not limited to the embodiment.

これらの各部品は、合成樹脂材の射出成型で形成すると良く、特にガソリン非透過性に優れるポリアセタール樹脂で形成することが好ましい。   Each of these parts is preferably formed by injection molding of a synthetic resin material, and is particularly preferably formed of a polyacetal resin excellent in gasoline impermeability.

次に、この圧力開閉弁の作動要領について図３、４を併せて参照して説明する。   Next, the operating procedure of this pressure on-off valve will be described with reference to FIGS.

この圧力開閉弁１は、流体通路６（第１ポート）とホース接続口４（第２ポート）との圧力が実質的に等しい通常時は、図２に示した状態にある。即ち、正圧弁体７に形成された負圧弁座２０に対して小径コイルばね１１の弾発力で弁頭部２１の球帯状部分２３が押し当てられると共に、負圧弁体収容部１２の開口側に形成された正圧弁座１３に大径コイルばね８の弾発力で正圧弁体７の環状膨出部１９が押し当てられている。これにより、流体通路６とホース接続口４との間の連通が断たれている。   The pressure on / off valve 1 is in the state shown in FIG. 2 at the normal time when the pressures in the fluid passage 6 (first port) and the hose connection port 4 (second port) are substantially equal. That is, the ball-shaped portion 23 of the valve head 21 is pressed against the negative pressure valve seat 20 formed on the positive pressure valve body 7 by the elastic force of the small diameter coil spring 11, and the opening side of the negative pressure valve body housing portion 12. An annular bulging portion 19 of the positive pressure valve body 7 is pressed against the positive pressure valve seat 13 formed by the elastic force of the large diameter coil spring 8. Thereby, the communication between the fluid passage 6 and the hose connection port 4 is cut off.

この状態から、燃料タンクの内圧が上昇して流体通路６とホース接続口４との差圧が所定値を超えると、図３に示したように、流体通路６からの正圧によって大径コイルばね８の付勢力に抗して正圧弁体７が開弁移動し、正圧弁体７の環状膨出部１９が正圧弁座１３から離間して流体通路６とホース接続口４との間が相互に連通する。このとき、負圧弁体１０は、小径コイルばね１１の弾発力によって正圧弁体７と一体の関係を維持したまま正圧弁体７と共に移動する。これにより、燃料タンク内の蒸発ガスが圧力開閉弁１を経てキャニスタ側へと流れ、燃料タンク内の圧力が大気開放される。   From this state, when the internal pressure of the fuel tank rises and the differential pressure between the fluid passage 6 and the hose connection port 4 exceeds a predetermined value, the large diameter coil is caused by the positive pressure from the fluid passage 6 as shown in FIG. The positive pressure valve body 7 opens and moves against the urging force of the spring 8, the annular bulging portion 19 of the positive pressure valve body 7 is separated from the positive pressure valve seat 13, and the space between the fluid passage 6 and the hose connection port 4 is separated. Communicate with each other. At this time, the negative pressure valve body 10 moves together with the positive pressure valve body 7 while maintaining an integral relationship with the positive pressure valve body 7 by the elastic force of the small diameter coil spring 11. Thereby, the evaporative gas in the fuel tank flows to the canister side through the pressure on-off valve 1, and the pressure in the fuel tank is released to the atmosphere.

この逆に、燃料タンク内が減圧し、流体通路６側よりもホース接続口４側が高圧になると、図４に示したように、流体通路６の負圧によって負圧弁体１０が小径コイルばね１１の付勢力に抗して開弁移動し、正圧弁体７に形成された負圧弁座２０から負圧弁体１０が離間し、正圧弁体７の中心部の負圧通路９が連通する。このとき、正圧弁体７は、大径コイルばね８の弾発力の方向と圧力傾斜の向きが同一であるため、正圧弁座２０に当接した状態が維持される。従って、キャニスタ側の正圧によってキャニスタから分離した蒸発ガスが圧力開閉弁１を経て燃料タンク内に流入し、燃料タンク内の圧力が大気開放される。   On the contrary, when the pressure in the fuel tank is reduced and the pressure on the hose connection port 4 is higher than that on the fluid passage 6 side, the negative pressure valve body 10 is turned into the small-diameter coil spring 11 by the negative pressure in the fluid passage 6 as shown in FIG. The negative pressure valve body 10 is separated from the negative pressure valve seat 20 formed in the positive pressure valve body 7, and the negative pressure passage 9 at the center of the positive pressure valve body 7 communicates. At this time, the positive pressure valve body 7 is kept in contact with the positive pressure valve seat 20 because the direction of the elastic force of the large-diameter coil spring 8 and the direction of the pressure inclination are the same. Accordingly, the evaporated gas separated from the canister by the positive pressure on the canister side flows into the fuel tank through the pressure on-off valve 1, and the pressure in the fuel tank is released to the atmosphere.

以上のようにして、この圧力開閉弁１の２方向逆止機能により、燃料タンク内の圧力を常に所定範囲に維持することができる。   As described above, the pressure in the fuel tank can always be maintained within a predetermined range by the two-way check function of the pressure on-off valve 1.

上述した圧力開閉弁１においては、ハウジングキャップ５に設けられたばね支承部（ばね座）２５の大径コイルばね８の端末との当接面が、ハウジング主部３の中心軸に直交せずに適宜な傾斜角度Ａが付けられている。そのため、自然状態における大径コイルばね８の中心軸が、ハウジング主部３の中心軸と平行ではなく、つまりハウジング主部の中心部に形成された正圧弁座１３の軸線に対し、大径コイルばね８の中心軸が適度な角度をもって傾くようになっている。これによると、大径コイルばね８を押し縮めつつハウジング主部３内に正圧弁体７を装着した際に、大径コイルばね８の弾発力の作用する向きが正圧弁座１３の軸線と平行ではなくなる。つまり、正圧弁体７の環状膨出部１９の外周面が正圧弁座１３に押し当てられた際に、その推力軸が傾いているために正圧弁体７が傾くこととなる。これにより、正圧弁体７の外周面の突条１８とハウジング主部３の内周面との間隔が不均一になり、ハウジング主部３の内周面に正圧弁体７が片当たりした形態になる。この意図的な片当たりにより、ハウジング主部３内で正圧弁体７が踊ることが防止され、流体の乱流や車体振動に影響されての打音発正が抑制される。   In the pressure on-off valve 1 described above, the contact surface of the spring support portion (spring seat) 25 provided on the housing cap 5 with the end of the large-diameter coil spring 8 is not perpendicular to the central axis of the housing main portion 3. An appropriate inclination angle A is given. Therefore, the central axis of the large-diameter coil spring 8 in the natural state is not parallel to the central axis of the housing main portion 3, that is, with respect to the axis of the positive pressure valve seat 13 formed at the central portion of the housing main portion. The central axis of the spring 8 is inclined at an appropriate angle. According to this, when the positive pressure valve body 7 is mounted in the housing main portion 3 while pressing and contracting the large diameter coil spring 8, the direction in which the elastic force of the large diameter coil spring 8 acts is the axis of the positive pressure valve seat 13. It is not parallel. That is, when the outer peripheral surface of the annular bulging portion 19 of the positive pressure valve body 7 is pressed against the positive pressure valve seat 13, the positive pressure valve body 7 is inclined because the thrust axis is inclined. Thereby, the space | interval of the protrusion 18 of the outer peripheral surface of the positive pressure valve body 7 and the internal peripheral surface of the housing main part 3 became non-uniform | heterogenous, and the positive pressure valve body 7 contacted the inner peripheral surface of the housing main part 3 piece by piece become. This intentional contact prevents the positive pressure valve body 7 from dancing in the housing main portion 3 and suppresses the striking sound correction caused by the turbulent flow of the fluid and the vehicle body vibration.

図５は、正圧弁体７への閉弁付勢力の軸線を傾ける別の手法を示している。これは、自然状態時にその軸線が傾くように巻いた大径コイルばね２６を用いるものである。これの場合、正圧弁座１３とばね支承部２５との中心同士を互いに合致させ、且つばね支承部２５の大径コイルばね２６の端末との当接面をハウジング主部３の中心軸に直交させておいても、大径コイルばね２６を押し縮めつつ正圧弁体７とばね支承部２５との間に装着すると、正圧弁体７に対する大径コイルばね２６の閉弁付勢力の中心が正圧弁座１３の中心からずれるので、上記の構成と同様の効果が得られる。   FIG. 5 shows another method for inclining the axis of the valve closing biasing force to the positive pressure valve body 7. This uses a large-diameter coil spring 26 wound so that its axis is inclined in a natural state. In this case, the centers of the positive pressure valve seat 13 and the spring support portion 25 are matched with each other, and the contact surface of the spring support portion 25 with the end of the large-diameter coil spring 26 is orthogonal to the central axis of the housing main portion 3. However, if the large-diameter coil spring 26 is attached between the positive pressure valve body 7 and the spring support portion 25 while being compressed, the center of the valve-closing urging force of the large-diameter coil spring 26 against the positive pressure valve body 7 is positive. Since it deviates from the center of the pressure valve seat 13, the same effect as the above configuration can be obtained.

なお、正圧弁体７への閉弁付勢力の軸線を傾ける手法としては、大径コイルばね８の支承部２５の中心と正圧弁座１３の中心とを互いに径方向にオフセットさせることも考えられるが、ハウジング主部３の内周面に正圧弁体７を片当たりさせるほどに大径コイルばね８の支承部２５の中心をずらそうとすると、ハウジングの大径化を招く。従って、ハウジングを大型化せずに済む上記の本発明による構成が好ましい。   In addition, as a method of inclining the axis of the valve closing biasing force to the positive pressure valve body 7, it is also conceivable to offset the center of the support portion 25 of the large diameter coil spring 8 and the center of the positive pressure valve seat 13 in the radial direction. However, if the center of the support portion 25 of the large-diameter coil spring 8 is shifted so that the positive pressure valve body 7 is brought into contact with the inner peripheral surface of the housing main portion 3, the diameter of the housing is increased. Therefore, the above-described configuration according to the present invention that does not require an increase in the size of the housing is preferable.

ところで、ハウジング主部３のホース接続体２との接続部の内周輪郭及びこれに対向する正圧弁体７の外周輪郭は、共にアーチ形の曲面をなしており、ここに形成される流体通路の曲率変化がより一層円滑にされている。これにより、特に燃料タンク側の正圧をキャニスタ側に開放する際に強い気流が発生し易くなる正圧弁体７の周囲を、乱流を生ずることなく円滑に流体が流過するので、正圧弁体７の振動抑制効果をより一層高めることができる。   By the way, the inner peripheral contour of the connecting portion of the housing main portion 3 with the hose connecting body 2 and the outer peripheral contour of the positive pressure valve body 7 facing this both form an arch-shaped curved surface, and the fluid passage formed therein The change in curvature is made smoother. Accordingly, the fluid smoothly flows without generating turbulent flow around the positive pressure valve body 7 where a strong air flow is easily generated particularly when the positive pressure on the fuel tank side is opened to the canister side. The vibration suppressing effect of the body 7 can be further enhanced.

ここでハウジング主部３とハウジングキャップ５との溶着部について触れておく。ハウジング主部３の周壁における開口端縁部からやや退いたところには、外向きフランジ３１が設けられている。そしてハウジング主部３の周壁の開口端縁部３２とフランジ３１との接続部には隅肉部３３が形成されている。   Here, the welded portion between the housing main portion 3 and the housing cap 5 will be described. An outward flange 31 is provided at a position slightly retracted from the opening edge of the peripheral wall of the housing main portion 3. A fillet portion 33 is formed at a connection portion between the opening edge portion 32 of the peripheral wall of the housing main portion 3 and the flange 31.

他方、ハウジングキャップ５におけるハウジング主部３との接合面には、ハウジング主部３の開口端縁部３２が嵌合する環状溝３４が形成されている。この環状溝３４の開口縁には、エッジが立っている。   On the other hand, an annular groove 34 into which the open end edge 32 of the housing main portion 3 is fitted is formed on the joint surface of the housing cap 5 with the housing main portion 3. An edge stands on the opening edge of the annular groove 34.

ハウジング主部３の開口端縁部３２をハウジングキャップ５の環状溝３４に嵌合させた状態で、ハウジング主部３とハウジングキャップ５とを超音波溶着法などで互いに圧接させると、隅肉部３３が溶融して両者が融着する。この際、開口端縁部３２の外周側で溶着するので、余剰な溶融樹脂が流出してもハウジング主部３の内側へは流れ込まないので、バリによる弁作動への悪影響が及ぶことがない。また、ハウジング主部３の周壁の開口端縁部３２とハウジングキャップ５の環状溝３４とを嵌合結合させることにより、従来の印籠結合に比してより高い結合力が得られる。   When the housing main portion 3 and the housing cap 5 are brought into pressure contact with each other by an ultrasonic welding method in a state where the open end edge portion 32 of the housing main portion 3 is fitted in the annular groove 34 of the housing cap 5, the fillet portion 33 melts and both are fused. At this time, since welding is performed on the outer peripheral side of the opening edge portion 32, even if excess molten resin flows out, it does not flow into the inside of the housing main portion 3, so that the valve operation due to burrs is not adversely affected. Further, by fitting and coupling the opening end edge portion 32 of the peripheral wall of the housing main portion 3 and the annular groove 34 of the housing cap 5, a higher coupling force can be obtained as compared with the conventional stamping coupling.

以上、２方向弁を例に上げて本発明を説明したが、本発明は、負圧弁体のない一方向逆止弁にも適用し得ることは言うまでもない。   The present invention has been described above by taking a two-way valve as an example, but it goes without saying that the present invention can also be applied to a one-way check valve having no negative pressure valve body.

以上詳述した本発明に係る圧力開閉弁は、各種容器やその他の閉鎖された空間内の加圧状態あるいは減圧状態に応じて自動的に弁を開閉し、各種容器やその他の閉鎖状空間内の圧力を一定範囲に保持するための自動調圧弁として好適に用いることができる。   The pressure open / close valve according to the present invention described in detail above automatically opens and closes the valve according to the pressurized state or the depressurized state in various containers and other closed spaces, and in various containers and other closed spaces. Can be suitably used as an automatic pressure regulating valve for keeping the pressure within a certain range.

本発明による圧力開閉弁の分解斜視図である。It is a disassembled perspective view of the pressure on-off valve by this invention. 本発明による圧力開閉弁の閉弁時を示す断面図である（実施例１）。It is sectional drawing which shows the time of valve closing of the pressure on-off valve by this invention (Example 1). 本発明による圧力開閉弁の正圧開弁時を示す断面図である。It is sectional drawing which shows the time of the positive pressure valve opening of the pressure on-off valve by this invention. 本発明による圧力開閉弁の負圧開弁時を示す断面図である。It is sectional drawing which shows the time of the negative pressure valve opening of the pressure on-off valve by this invention. コイルばねの別例である（実施例２）。It is another example of a coil spring (Example 2).

符号の説明Explanation of symbols

１ 圧力開閉弁
３ ハウジング主部
４ ホース接続口
５ ハウジングキャップ
６ 流体通路
７ 正圧弁体
８ 大径コイルばね
１０ 負圧弁体
１１ 小径コイルばね
１３ 正圧弁座
２５ ばね支承部
２６ コイルばね DESCRIPTION OF SYMBOLS 1 Pressure on-off valve 3 Housing main part 4 Hose connection port 5 Housing cap 6 Fluid passage 7 Positive pressure valve body 8 Large diameter coil spring 10 Negative pressure valve body 11 Small diameter coil spring 13 Positive pressure valve seat 25 Spring support part 26 Coil spring

Claims (4)

第１ポートと第２ポートとを備えたハウジングと、該ハウジング内に収容され、ばねによって付勢されて前記第１ポートを通常は閉塞し且つ前記第１ポートと前記第２ポートとの差圧が所定値を超えると開く弁体とを有する圧力開閉弁であって、
前記弁体に作用する前記ばねによる閉弁付勢力の軸線が、前記弁体が当接する弁座の軸線に対して不平行となるようにしたことを特徴とする圧力開閉弁。 A housing having a first port and a second port; and a pressure difference between the first port and the second port that is received in the housing and biased by a spring to normally close the first port; Is a pressure on-off valve having a valve body that opens when the value exceeds a predetermined value,
A pressure on-off valve characterized in that an axis of a valve closing urging force by the spring acting on the valve body is not parallel to an axis of a valve seat with which the valve body abuts. 第１ポートと第２ポートとを備えたハウジングと、該ハウジング内に収容され、燃料タンク内の正圧に抗してばねによって閉弁付勢されて所定の正圧値で開弁する正圧弁体と、燃料タンク内の負圧に抗してばねによって閉弁付勢されて所定の負圧値で開弁する負圧弁体とを有し、燃料タンク内の液面上空間とキャニスタとを結ぶ通路内に設けられた圧力開閉弁であって、
前記正圧弁体に作用する前記ばねによる閉弁付勢力の軸線が、前記正圧弁体が当接する弁座の軸線に対して不平行となるようにしたことを特徴とする圧力開閉弁。 A housing having a first port and a second port, and a positive pressure valve that is housed in the housing and is urged to close by a spring against a positive pressure in the fuel tank and opens at a predetermined positive pressure value Body and a negative pressure valve body that is energized by a spring against a negative pressure in the fuel tank and opens at a predetermined negative pressure value, and has a space above the liquid level in the fuel tank and the canister. A pressure on-off valve provided in a connecting passage,
A pressure on-off valve characterized in that an axis of a valve closing urging force by the spring acting on the positive pressure valve body is not parallel to an axis of a valve seat with which the positive pressure valve body abuts. 前記ばねをコイルばねとし、前記弁座の軸線に対して直角以外の角度をもって交わるばね座を前記ハウジングに設け、自然状態時の軸線が前記弁座の軸線に対して不平行となるように前記コイルばねを前記ばね座に装着したことを特徴とする請求項１又は２に記載の圧力開閉弁。   The spring is a coil spring, and a spring seat that intersects at an angle other than a right angle with respect to the axis of the valve seat is provided in the housing, and the axis in a natural state is not parallel to the axis of the valve seat. The pressure on-off valve according to claim 1 or 2, wherein a coil spring is mounted on the spring seat. 前記ばねが、両端の中心同士を互いにオフセットさせて巻いたコイルばねからなることを特徴とする請求項１又は２に記載の圧力開閉弁。   The pressure on-off valve according to claim 1 or 2, wherein the spring comprises a coil spring wound by offsetting the centers at both ends.
JP2003312477A 2003-09-04 2003-09-04 Pressure opening and shutting valve Pending JP2005083395A (en)

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GB0419212A GB2405684B (en) 2003-09-04 2004-08-31 Pressure opening and closing valve
CNB2004100742493A CN100383448C (en) 2003-09-04 2004-09-03 Pressure opening and closing valve
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